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Analog Devices Inc. LTC1290DCSW#TRPBF
- Part No.:
- LTC1290DCSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1290DCSW#TRPBF.pdf
- Description:
- IC DAS/ADC 12BIT 50K 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
LTC1290DCSW#TRPBF from Analog Devices (acquired Linear Technology) is a 12-bit, 8-channel serial sampling data acquisition system IC with integrated sample-and-hold, successive approximation ADC, and configurable analog multiplexer. It supports single-ended or differential inputs, ±5V common-mode range, 50kHz max throughput, and operates from single 5V or dual ±5V supplies. It is used in industrial sensor monitoring systems requiring multi-channel precision analog input conditioning.
For engineers reviewing the LTC1290DCSW#TRPBF datasheet, LTC1290DCSW#TRPBF pinout, LTC1290DCSW#TRPBF application, or LTC1290DCSW#TRPBF equivalent, key selection criteria include its software-programmable unipolar/bipolar mode, 12-bit resolution with no missing codes guaranteed, 13µs max conversion time, 6.0mA typical supply current, and compatibility with MICROWIRE/SPI-style serial interfaces on microprocessors such as COP402 and MC68HC05C4.
Technical Context
The LTC1290DCSW#TRPBF implements an LTCMOS switched-capacitor SAR architecture with on-chip sample-and-hold for all single-ended channels. Its 8:1 analog multiplexer supports four differential or eight single-ended input configurations via software-controlled MUX address bits, with independent COM reference handling.
Serial communication uses a synchronous, full-duplex four-wire interface (CS, SCLK, DIN, DOUT) supporting MSB-first or LSB-first data sequencing and programmable 8/12/16-bit output word length. Power shutdown is activated via WL1=0/WL0=1 configuration, reducing ICC to ≤15µA at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit unipolar or 11-bit + sign bipolar - enables 4096 distinct codes over 0–5V or ±5V input spans. |
| Throughput Rate | 50kHz maximum - supports real-time sampling of signals up to ~20kHz under Nyquist criterion. |
| Conversion Time | 13µs max over temperature - ensures deterministic timing for time-critical control loops. |
| Supply Current | 6.0mA typical (CS high), ≤15µA in power shutdown - suitable for low-power portable or battery-backed DAQ systems. |
| Input Configuration | Software-selectable 4 differential or 8 single-ended channels - allows flexible sensor interfacing without external mux hardware. |
| Analog Input Range | ±5V common-mode, 0–5V or ±5V single-ended - accommodates industrial transducers and bipolar signal sources. |
| Reference Voltage Range | VREF+ to VREF– = 0.1V to 5V - permits use of internal or external references including LT1027. |
Pinout & Package
Package: 20-lead plastic SO wide (SW), RoHS-compliant, lead-free (#PBF), tape-and-reel (#TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (1–8) | Analog Input Channels | Eight configurable analog inputs; each can be assigned as + or – in differential pairs or referenced to COM in single-ended mode. |
| COM (9) | Single-Ended Reference | Zero-reference point for all single-ended measurements; must be low-noise and tied directly to analog ground plane. |
| DGND (10) | Digital Ground | Return path for internal logic; separate from AGND to prevent digital noise coupling into analog path. |
| AGND (11) | Analog Ground | Primary analog reference node; requires star grounding and direct connection to analog ground plane. |
| V– (12) | Negative Supply Rail | Supports bipolar operation down to –6V; tied to ground in single-supply 5V systems. |
| REF+, REF– (13–14) | Reference Inputs | Define full-scale range; accept 0.1V–5V differential voltage; require low-impedance, low-noise bypassing. |
| CS (15) | Chip Select | Active-low enable for serial interface; includes deglitching circuit rejecting noise <1 ACLK cycle. |
| DOUT (16) | Serial Data Output | Three-state output delivering conversion result; transitions from Hi-Z to valid data after two ACLK falling edges post-CS↓. |
| DIN (17) | Serial Data Input | Accepts 8-bit configuration word defining MUX channel, unipolar/bipolar mode, MSB/LSB order, and word length/power-down. |
| SCLK (18) | Shift Clock | Synchronizes serial data transfer; data latched on rising edge, output shifted on falling edge (full-duplex). |
| ACLK (19) | A/D Conversion Clock | Controls internal SAR timing; max 4MHz; frequency affects S/H droop and leakage-induced errors at temperature extremes. |
| VCC (20) | Positive Supply | 4.5V–5.5V operation; requires local 1µF+ tantalum bypass to AGND to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip sample-and-hold | Eliminates need for external S/H circuitry in single-ended acquisitions, reducing BOM count and layout complexity. |
| Software-configurable input topology | Enables runtime reconfiguration between differential and single-ended modes without hardware changes. |
| Programmable data word length (8/12/16 bits) | Allows seamless integration with 8-bit microcontrollers (e.g., COP402) or 16-bit processors (e.g., MC68HC05C4) without bit-shifting overhead. |
| Power shutdown mode | Reduces ICC to ≤15µA, enabling ultra-low-power sleep states in battery-operated sensor nodes. |
| Direct MICROWIRE/SPI interface | Supports native connection to industry-standard serial ports without level shifters or glue logic. |
Applications
| Industrial Process Monitoring | Automotive Sensor Hub |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs across 4–8 channels in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central 12-bit DAQ subsystem performing synchronized sampling, digitization, and serial streaming to host MCU. Use Value: Eliminates discrete op-amp/mux/ADC combinations; reduces PCB area by >40% while maintaining ±0.5 LSB INL and 50kHz aggregate throughput. | Use Scenario: Aggregating analog signals from engine coolant temp, throttle position, O2 sensors, and brake fluid pressure in ECU pre-processing stage. IC Role / Device Role / Timing Role: High-immunity analog front-end with ±5V common-mode range tolerating automotive ground bounce and EMI. Use Value: Differential input capability rejects common-mode noise up to 50kHz; 13µs conversion time enables sub-20µs loop latency for closed-loop fuel injection control. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Battery-powered ECG/EKG device acquiring biopotential signals from multiple leads with selectable gain and filtering. IC Role / Device Role / Timing Role: Low-noise, low-power analog acquisition core with software-selectable unipolar/bipolar mode for DC-coupled electrode biasing. Use Value: 6.0mA active current and µA-level shutdown extend battery life; built-in S/H enables precise timing alignment across channels. | Use Scenario: Benchtop multichannel data logger capturing transient waveforms from vibration sensors, strain gauges, and thermocouples. IC Role / Device Role / Timing Role: Precision sampling engine with guaranteed no-missing-codes performance and calibrated offset/linearity specs. Use Value: 12-bit resolution with ±0.5 LSB INL and ±1.5 LSB offset error ensures traceable measurement accuracy compliant with IEC 61000-4-3 immunity testing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar data acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200kSPS, SPI-only interface, no differential MUX, requires external REF, 3.3V/5V supply | Higher speed but lacks software-configurable differential/single-ended flexibility and on-chip S/H for single-ended channels | Select when throughput >100kSPS is required and system already uses external reference and dedicated S/H |
| MAX11131ETE+ | 12-bit, 500kSPS, internal REF, SPI interface, 8-channel single-ended only, 2.7–3.6V supply | Higher speed and integrated reference, but incompatible with ±5V analog inputs and bipolar operation | Select for low-voltage, high-speed portable designs where ±5V signal conditioning is not needed |
Compared with ADS7822U and MAX11131ETE+, the LTC1290DCSW#TRPBF uniquely combines 8-channel configurability (differential or single-ended), on-chip S/H for all single-ended paths, ±5V input tolerance, and dual-supply operation - making it irreplaceable in legacy industrial systems requiring robust 5V-compatible analog front-ends with minimal external components.
Availability
LTC1290DCSW#TRPBF is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor hubs, portable medical instrumentation, and test & measurement equipment requiring stable component supply and long-term obsolescence management.
Supply support for LTC1290DCSW#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC1290DCSW#TRPBF belongs to ADI's legacy Linear Technology data acquisition product line, designed specifically for cost-sensitive, medium-speed industrial and instrumentation applications requiring integrated analog signal conditioning with minimal external components.
FAQ
What is the operating temperature range for the LTC1290DCSW#TRPBF?
The LTC1290DCSW#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade, denoted by 'D' suffix). This is confirmed in the Absolute Maximum Ratings table and applies to all DC-grade variants including LTC1290DCSW and LTC1290DCSW#TRPBF. Performance specifications such as offset error (±1.5 LSB), INL (±0.75 LSB), and gain error (±4.0 LSB) are guaranteed across this full range.
Does the LTC1290DCSW#TRPBF support true differential input measurements across all eight channels?
No. The LTC1290DCSW#TRPBF supports differential measurements only across four adjacent channel pairs: CH0–CH1, CH2–CH3, CH4–CH5, and CH6–CH7. This is defined by the MUX Address table in the datasheet. Single-ended mode allows all eight channels referenced to COM. The part does not support arbitrary differential pairings like CH3–CH7.
Can the LTC1290DCSW#TRPBF operate from a single 3.3V supply?
No. The LTC1290DCSW#TRPBF requires a minimum VCC of 4.5V and maximum of 5.5V per Absolute Maximum Ratings and Recommended Operating Conditions. Operation at 3.3V is outside specification and will cause functional failure, including invalid conversions and undefined serial interface behavior. It is not 3.3V-compatible.
How is power shutdown activated on the LTC1290DCSW#TRPBF?
Power shutdown is activated by sending a configuration word with WL1 = 0 and WL0 = 1 on the DIN line during a CS-active cycle. This places the LTC1290DCSW#TRPBF into low-current state (≤15µA). Note that the previous conversion result is output as a 10-bit word, so a "dummy" conversion cycle is required before shutdown to ensure valid data is not lost.
What is the maximum ACLK frequency supported by the LTC1290DCSW#TRPBF?
The maximum ACLK frequency for the LTC1290DCSW#TRPBF is 4.0MHz, specified under AC Characteristics for all temperature grades. This clock controls the internal SAR conversion timing. Exceeding 4MHz violates the absolute maximum rating and may cause conversion errors, increased INL, or latch-up due to internal timing violations.
LTC1290DCSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V, ±5V
- Voltage - Supply, Digital:
- 5V, ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1290DCSW#TRPBF FAQ
1.How can I place an order for LTC1290DCSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1290DCSW#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1290DCSW#TRPBF reliable?
The price and inventory of LTC1290DCSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1290DCSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1290DCSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1290DCSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1290DCSW#TRPBF?
LTC1290DCSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1290DCSW#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1290DCSW#TRPBF?
For technical support, including LTC1290DCSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1290DCSW#TRPBF requirements.
6.How does Aetrix verify that LTC1290DCSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1290DCSW#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1290DCSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1290DCSW#TRPBF?
All LTC1290DCSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1290DCSW#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1290DCSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1290DCSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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